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Interfacing to the Analog World
To be useful, A/D or D/A converters must have meaningful representation of the analog quantity and a digital representation and the digital quantity as an analog representation.
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Interfacing to the Analog World
When a DAC output shows a deviation of the measured step size from the ideal step size, this error is called nonlinearity.
An eight-bit D/A converter has a resolution of 0.125.
If the least significant bit (LSB) of a four-bit binary-weighted resistor D/A converter connects to a 200 Ω resistor, then the resistor needed for the next bit is 100 Ω.
It is possible to develop more than 16 different analog levels using 4-bit resolution.
Generally speaking, DACs with a current output will have a shorter settling time than those with voltage outputs.
D/A conversion is the process of taking a voltage or current and converting it to a digital code.
Linearity error is the maximum deviation in step size from the ideal step size.
The DAC0808 and the MC1408 are very popular and inexpensive 8-bit D/A converters.
The primary disadvantage of the flash A/D converter is the large number of comparators required.
A simultaneous, multiple comparator, or flash converter uses parallel encoding.
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